Toro String trimmer will not start; good spark; getting gas

Have confirmed by multiple methods that spark and gas are good, but many many tries with different fuel mixture settings (choke, mixture adjustment screws, air filter cleaned /removed) yields not even the hint of it 'catching'. my guess is it has to be a timing problem but not really familiar with small 2-cycle engines. what are the possible problems & fixes?

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that is the correct spark plug for the unit. i work at a power equipment store where we work on homelites. 90% of the time it wont start or run right is usually carb issues . need to get it rebuild or replaced

The carburetor needs to be removed and inspected. The malfunctions possibly indicate the need for a repair kit. I've been unable to locate your exact model, but if it has the 2-Stroke engine (gas/oil mix), then you will at the very least..need a gasket and diaghragm kit installed per inspection. There is the possibility that the carburetor needs a complete rebuild and would require the complete rebuild kit. Remove the gas lines (after draining gas). Remove the carb and inspect the screws and tightness of the screws in the 2 end covers. Are the screws tight? If not tighten them up and reinstall, trying to restart the machine. Post back if needed.

The thinner string works well in these machines and puts a lot less strain on them. I would suggest using a string of .065 range. The thicker (and more expensive) string used in the gas machines is too heavy for these lower powered electric units.

Check to ensure that the string is the correct size as specified in the owners manual. If ok check age of the string. If old it has a tendancy to be brittle. If new and supple try letting the trimmer get up to full speed and let the tip of the string do the cutting. Avoid taking on too much at once with this trimmer as the electric and battery trimmers are not as powerful as their gas counterparts. I hope this helps.